Filter systems and flue gas cleaning
There are two ways to filter the exhaust gas.
On the one hand there is the wet and dry washing technology and on the other hand the electrostatic filter technology.
For our dry washing technology we can offer ceramic filters and fabric filters.
We prefer ceramic filters for our furnaces up to 400 kg/h, as these have a very high filter efficiency on the one hand and a very long service life on the other.
Which of these both filter technologies is suitable is mainly a question of the amount of exhaust gas and the media itself.
Several modules can thus form a filter system.
By default, these are made up of 1-2-3 and 4 modules and so on.
The design of a plant is based on its operating data.
For our dry-washing systems we additionally recommend to use a dry-scrubbing-solvent injection system.
These dry scrubbing systems are used to remove corrosive and toxic gases (for example SO2 and HCl) from the exhaust gas.
They are very effective with low investment and operating costs.
The temperature range for the dry-scrubbing solvent should be from 170°C up to 300°C.
In this range the dry-scrubbing solvent can transfer the contents.
Flue gas mixed with dry-scrubbing solvent create a layer on outside surface of the filter and accumulate during operation.
At a certain differential pressure level the filter will be cleaned by pressure air with a reverse jet cleaning system which clean the filter by a jet impulse and the dust layer on the outside surface of the filter will fall down.
Therfor a standstill heater is additionally recommended to protect the housing from corrosion.
This heater is only an option, because if it is necessary depends allways only on local conditions.
Please note that each system requires an individual configuration.
Mid-sized incineration plants as an example of a sustainable investment
Download the technical data sheets of the combustion furnace, the flue gas cooler and the filter system as PDF file
Example of a modern Mid-sized stationary combustion plant.pdf (248.48KB)
An example filter system for a first impression
Flue gas from combustion process
RDF (Refuse Derived Fuel) *
Mix of clinical waste, paper and fabric residues, polymers, other solid and sludgy waste fractions, like sewage sludge.
* only for sample
Flue gas from flue gas cooler
Volume flow flue gas inlet to flue gas cooler
15.215 Bm³/h **
** Bm³/h means "actual" (B) cubic metres (m³) per hour (h) @ operating pressure, temperature and humidity
Volume flow flue gas outlet from flue gas cooler
5.240 Bm³/h **
Exhaust gas outlet tempeature
Flue gas and filter area
Total flue gas wet to filter
3019 Nm³/h ***
*** Nm³/h means cubic metres (m³) @ atmospheric pressure (1013,25 hPa) and a standard temperature (0 °C) per hour (h)
Humid exhaust gas operating volume flow
5240 Bm³/h **
Total filter area
Filter elements diameter (outside)
Filter elements circumference
Filter cartridge length
1250, 1500, 1750 max.
Filter area per piece
Required number of filter elements
Installed number of filter elements
196 per module
Compressed air demand
Specific compressed air requirement
Compressed air requirement
6,288 Nm³/h ***
< 3 mg/Nm³
< 10 mg/Nm³
< 50 mg/Nm³
< 1 mg/Nm³
< 200 mg/Nm³
< 0,5 mg/Nm³
< 0,5 ng/Nm³
Subject to change.
Sample data only.
Changes to individual parameters can affect all values!